README
¶
fastcommp
Filecoin fast piece commitment summation tool.
usage
fast := new(fastcommp.CommpWriter)
fast.Write(data)
sum, err := fast.Sum()
if err != nil {
panic(err)
}
fmt.Printf("commP: %s\n", sum.PieceCID.String())
build
make build
execute
./fastcommp <carfile.car>
optional: create car dummy data
- create an 8 GiB test file
dd if=/dev/urandom of=8G-payload.bin bs=1M count=8192
- car it up with
https://github.com/ipld/go-car(install withgo install github.com/ipld/go-car/cmd/car@latest)
car c --version 1 -f 8G-payload.bin.car 8G-payload.bin
benchmarks
* benchmarks run on optimized AMD hardware with ~1TB available memory
Documentation
¶
Index ¶
Constants ¶
View Source
const CommPBuf = abi.UnpaddedPieceSize(commPBufPad - (commPBufPad / 128))
CommPBuf is the size of the buffer used to calculate commP
Variables ¶
This section is empty.
Functions ¶
This section is empty.
Types ¶
type CommpWriter ¶
type CommpWriter struct {
// contains filtered or unexported fields
}
CommpWriter is a writer that calculates the CommP
func (*CommpWriter) Sum ¶
func (w *CommpWriter) Sum() (DataCIDSize, error)
type DataCIDSize ¶
type DataCIDSize struct {
PayloadSize int64
PieceSize abi.PaddedPieceSize
PieceCID cid.Cid
}
DataCIDSize is the result of a DataCID calculation
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